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	<script type="text/javascript">

		function Person(name, age, gender) {
			this.name = name;
			this.age = age;
			this.gender = gender;
		}

		//修改Person原型的toString
		Person.prototype.toString = function () {
			return "Person[name=" + this.name + ",age=" + this.age + ",gender=" + this.gender + "]";
		};


		//创建一个Person实例
		var per = new Person("孙悟空", 18, "男");
		var per2 = new Person("猪八戒", 28, "男");

		//当我们直接在页面中打印一个对象时，事件上是输出的对象的toString()方法的返回值
		//如果我们希望在输出对象时不输出[object Object]，可以为对象添加一个toString()方法
		//Person[name=孙悟空,age=18,gender=男]
		/*per.toString = function(){
			return "Person[name="+this.name+",age="+this.age+",gender="+this.gender+"]";
		};*/

		var result = per.toString();
		//console.log("result = " + result);
		//console.log(per.__proto__.__proto__.hasOwnProperty("toString"));
		console.log(per2);
		console.log(per);


	</script>
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